I've pretty much chalked it up to 'stuff happens'. I followed all the 'rules' for safety and it still didn't get along well. Greased the ends, ampco nipples, RWS 1075 caps that fit well. The only thing I can figure may have happened was that the grease came out of the top of the cylinder...it's happened before. Perhaps it was dislodged and the next shot set them off. I hate to use lubed wads since it increases my per-shot cost, but it's a viable option if I make my own.